Attachment for rock drill tools



Aug. 8, 1933- A. E. BUNDSEN ATTACHMENT FOR ROCK DRILL TOOLS Filed Dec.

INVENTOR. A DOL F E. BUNDSEN.

BY mum/WW 00.

A TTORNEYS.

' Patented Aug. 1933 isz isli ATTAcnMENT on noon arrin TOOLS Adolf E.Bun-risen, PaloAlt-o, Califl, assignor to Richard. T. Eundsen, SanFrancisco, Calif.

Application December 22, 1930. Serial No. c4,151

1 Claim.

My invention relates to improvements in at-.

tachments for rockdrill tools, and it consists in the combinations;constructions and arrangements hereinafter described and claimed.

In rock drill tools an enlarged portion is formed by heating the'tool atthe. desired place and then compressing the heated portion for causingit to bulge into an annular rib. The tool is hollow, and this causes thebore at the portion enlarged to expand radially. After the portion hascooled, it is forged down to the proper, size, and this often weakensthe toolat'the enlargedportion because the forging will come close tothe'enlarged bore. Thetool will also be'w'eakened at this point due tothe extreme heating which the enlarged portion has been subjected to VThe principal object of my present invention is to provide a toolattachment which may be applied to any place on the tool and which maybe clamped in position and function in thesame manner as if the toolwere enlarged by the method above described; The tool is not weakenedbythis arrangement, and the life of it is therefore materially increased.I A further object of my invention is to provide a device of thetypedescribed which is extremely simple in construction and which isdurable and efficient forthe purpose intended.

My invention is illustrated in the accompanying drawing in which;

Figure lshows the lower portion of a rock drill and the upper part of atool showingmy invention operatively applied thereto,

Figure 2 is a side elevation of a part of the tool showing the inventionin section,

Figure 3 is a section along the line 3-3 of Figure 2,

Figure 4 is device,

Figure 5 is a of a modified form of the inventiomand' a section througha part of the Figure 6 is a section along the line 6-43 of Figure 5. Y,

In carrying out my invention I make use of a rock drill indicatedgenerally at 1, this drill having a piston 2, a toolturning sleeve 3,and a yoke 4 adapted to retain the upper end of the tool within thebarrel of the drill. The yoke 4 is pivotally consists of two parts 7 and8 which may be ad-, 5 justably secured to the tool 5 at any-desiredposition, and will take the place of the enlarging of the tool in themanner set forth in the first part of the specification; The part '1isclearlyshownb in Figures2 and 4, and is in reality a split sleeve sideelevation partly broken away having a non-circular inner surface 9 and aconical-shaped threaded outer surface 10. The inner faces 11 of thenon-circular inner surface 9 are formed slightly arcuate in shape sothat when the split sleeve is constricted about the tool 5 the faces 11will firmly press against the non-circular ,outer surface of the tooland will securely grip the tool. In order to aid in'the gripping, thefaces 11 are serrated as at 12 (see Fig. 4)

The other part 8 of the invention is a collar which is threadedinternally-as at 13.- In assembling the device to the tool, the splitsleeve? is first moved-into the desired position and then the threadedcollar 8 is screwed upon the threaded portion 10. lime to the fact thatthe'threaded portion 10 is conical in shape, thecollar will cause thesplit sleeve to securely grip the tool. *The' serrations l2 aid in thisgripping. projection which takes the place of theone; made under the oldmethod and which does'not weaken the'structure of the tool.

In Figures 5 and 6 I show a modified form of the invention in which atool'25'has a cylindrical outer surface. A split sleeve 26 therefore hasa cylindrical inner surface, 2'7 conforming to the outer surface ofthe'tool, and the surface 27 is serrated for gripping the tool. A collar28 is conical threaded portion grasp the abutting ends of the brokendrill. Although I have shown and described only two embodimentsof myinventionjit isto be understood that thesanie is susceptible to variouschanges asrnay come within the scope of the claims hereto annexedwithoutdeparting from the spirit of the invention. I

Iclairn: V

Anattachrnent for a drill tool comprising an annular unit sleeve splitlengthwise on one side thereof and having serrations on its inner surface and a conical-shaped outer surface, and a. threadedcollar-mountedon the sleeve adapted for constricting the lattenthe inner surface ofthe sleeve being non-circular and defined by a. plurality of surfacesarcuate in plan and flaring outwardly towardthe junction of thesurfaces,

faces. I

-. .ADQLF E. BUNDSEN.

The result is a would be made of a sufiicient length asto firmly Thisform 0. the device is secured to the the serrations being formed in theseveralsur-

